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/* Copyright (c) 1995 Regents of the University of California */ |
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/* Copyright (c) 1996 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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persistfile(pfn) /* open persist file and lock it */ |
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char *pfn; |
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{ |
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persistfd = open(pfn, O_WRONLY|O_CREAT|O_EXCL, 0666); |
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persistfd = open(pfn, O_WRONLY|O_CREAT|O_EXCL, 0644); |
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if (persistfd >= 0) { |
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persistfname = pfn; |
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pflock(1); |
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} |
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int sig_noop() {} |
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static int got_io; |
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static int sig_io() { got_io++; } |
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static int sig_alrm() { quit(0); } |
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pfhold() /* holding pattern for idle rendering process */ |
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{ |
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int (*oldalrm)(); |
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char buf[512]; |
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register int n; |
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/* close input and output descriptors */ |
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if (write(persistfd, buf, n) < n) |
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error(SYSTEM, "error writing persist file"); |
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/* wait TIMELIM for someone to signal us */ |
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signal(SIGIO, sig_noop); |
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got_io = 0; |
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signal(SIGIO, sig_io); |
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oldalrm = (int (*)())signal(SIGALRM, sig_alrm); |
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alarm(TIMELIM); |
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pflock(0); |
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pause(); |
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while (!got_io) |
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pause(); |
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alarm(0); |
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signal(SIGALRM, oldalrm); |
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signal(SIGIO, SIG_DFL); |
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pflock(1); |
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/* someone wants us; reopen stdin and stdout */ |
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char buf[512], *pfin, *pfout; |
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int pid; |
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/* load and close persist file */ |
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sleep(5); /* helps synchronization */ |
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nr = read(persistfd, buf, sizeof(buf)-1); |
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pfdetach(); |
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if (nr < 0) |
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if (nr <= 0) |
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error(SYSTEM, "cannot read persist file"); |
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buf[nr] = '\0'; |
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if ((cp = index(buf, ' ')) == NULL) |